Pneumatic plastering machine



1,559,666 N. M. BERNIER I PNEUMATIC PLASTERING MACHINE Filed March 12, 1925 Nov. 3, 1925- \nve-nTor. Napoleon-M. Bernie? Patented: Nov. 3, 1925.

UNITED STATES xuonnonx.

,PArENr OFFICE-l.

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application fled larch 12, 1825. serial 10. 14,9. I

To all whom it-may 0011mm:-

Be it known that I, NAPOLEON M. BER- NIER, a citizen of the United States, and

resident of Cambrid e, county of Middle- This invention relates to a pneumatic plastering machine for depositing plaster, cement and likeplastic material on walls or floors and it has for its principal object to provide a novel machine of this type which is relatively simple in construction and which can be used with either plaster or cement and which has other advantages all as will be more fully hereinafter set forth.

In order to give an understanding of the invention I have illustrated in the drawings a selected embodiment thereof which will now be described, after which the novel features will be pointed out in the appendedclaims.

The drawings,show in vertical section a machine embodying the invention.

The device comprises a tank adapted to contain the plaster, cement or other plastic material and provided with a discharge port through which the material is fed, a receiving chamber communicating with the discharge port and having a delivery pipe leading thereinto at substantially right angles to the discharge port of the tank, means for delivering air under pressure into the receiving chamber in the direction of the delivery pipe whereby the plaster or cement is aerated and is carried along through the delivery pipe in this condition:

In the drawings 1 indicates a tank or container adapted to contain the cement, plas v ter, or other plastic material indicated vtit-2 This tank is provided with a filling opening in its upper end which is closed by a cover 3, the latter being clamped tightly in place through the medium of the yoke 4 and clamping screw 5 screw threaded on the stem 6 of the cover.

The tank is provided at its lower endvwith a discharge port 7 through which the material is discharged. This port leads into a receiving chamber 8. This receiving chamber has connected thereto a delivery pipe 9 which is preferably in the form of a flexible hose and which is provided at its end with a delivery nozzle 10. The delivery pipe 9 leads from the receiving chamber 8 In a' direction at right angles to the discharge port7.

The material 2 receiving chamber 8 through the discharge port 7 both by mechanical means and by air pressure, p

11 indicates an air pipe leading from a tank 12 or other source of compressed air supply into the upper end of the tank 1, said pipe being provided with a valve 13 by which it may be controlled. By means of this pipe and the air'tank12 it is possible is forced or fed into the to build up an air pressure at the upper end therein which will have a tendency to force .the material outwardly through the dis -charge port 7.

The mechanical means for assisting in feeding the material 2 through the discharge port 7 comprises a feed screw 14 which extends through the discharge port 7 and into the lower end ofthe tank 1 and is herein shown as mounted on a shaft 15 {which ex.- tends through the discharge port and receiving chamber 8 and through a bearing 16 at the lower end of said chamber, said shaft leading to a motor 17 by which it may be operated. This motor may conveniently be an air motor which receives its motive power from the compressed air tank 12 through a supply pipe 18, the latter having a control valve 19 therein;

The shaft 15 is illustrated as having a collar 20 thereon which serves as a packing of the tank 1 above the plastic material 2 I and prevents the plastic material from being is provided with arms 21 which constitute stirrers or agitators for keeping the plastic material adjacent the discharge port 12 stored up and in plastic condition. These stirrers also prevent the formation of air pockets.

The plastic material is forced from the 7 receiving chamber 8 into and through, the delivery pipe 9 by" air pressure and for this purpose I connect the receiving chamber 8 to the compressed air tank 12 by means of a pipe 22 which has a control valve 23 therein. This pipe delivers its air blast into the chamber 8 in a direction at right angles to I that in which the material is fed into the chamber and as a result as fast as material is delivered to the chamber 8 it is filled with 10 v Y which delivers into the discharge portof the air and is -cs trried laterally into and through the delivery pipe 9. I find that b this construction the plastic material will so thoroughly aerated and flufi'ed up by the air that it will be readily carried through a relatively lon delivery pipe withoilt danger of the pipe o'gging'.

ladder to further assistin a free delivery of the plastic material from the nozzle the latter is provided with anxair jet 24 nozzle and which is connected b a' pipe'25 to the compressed air tank 12. is pipe 25 is controlled by a valve 26.} A valve 27 is preferably used for controlling the delivery pipe 9. I

I find that with this construct-ion, wherein the plastic material is delivered to a receiving chamber in one direction and wherein the delivery pipe firom the receiving chamberis at right angles to the discharge port of thetank and a stream f compressed air is delivered into the receiving chaniber at right angles to the discharge port, iti'is possible to successfully deliver plaster or cement from the nozzle without danger ofthe apparatus clogging.

30 indicates a s1 al herein shown as an electric bell which is connected by a circuit 29 witha push button 28 on the nozzle so.

material from the tank through the discharge port into the receiving chamber, a delivery pipe connected to the receiving means to rotate the shaft, a delivery signal back to the container, it being cacao opposite end of the tank from the discharge" port, 'and'means for deliver air. under pressure into. the receiving cham r at right angles to the dischar e port;

2. In a device of t e class described, the combination with a tank ha a dischar port, .a receiving chamber wit port communicates, .a shaft extending through said receiving chamber ,and discharge port, a screw on the shaft for. feedmg material through the discharge port, agltatingarms also carried by .said shaft,

1pc extending from the receiving chamberiin a direction at right angles to the discharge port, and means to deliver air under pressure into the receiving chamber and aslo to deliver air under pressure into the-tank.

3. In a device of the class described, the combination with a tank having a discharge port, a receiving chamber with which saida I shait extending port communicates, through said receiving chamber and diswhich 881d charge port, a'screw on the shaft for feeding material through the discharge port, agitating arms also carriedhy said shaft, means to rotate the shait,-a delivery pipe extending from the receiving chamberin a direction at right angles to the discharge port, means to deliver air underpressure into the receiving chamber and also to deliver air under pressure into thetank, adistributing nozzle on the end of the delivery pipe, and means to deliver an air jet into the deliv-- ery passage of the nozzle thereby to assist in the delivery of the material therefrom:

In testimony whereof, I have signed my name to thiss ecification;

N OLEON BERNIER. 

